3D打印导航模板在辅助寰枢椎椎弓根螺钉置入中的应用价值

目的:探讨三维(3D)打印导航模板辅助寰枢椎椎弓根螺钉置钉的价值。方法:回顾性分析2013年1月~2015年10月我院收治的43例寰枢椎骨折和/或脱位患者,均行后路寰枢椎切开复位内固定术。按手术方式不同分为3D打印导航模板组(19例)和传统置钉组(24例)。3D打印导航模板组术前将患者的颈椎CT数据导入Mimics 17.0软件,行3D重建并设计带钉道的导航模板后打印、消毒;术中将导航模板与置钉椎体贴合紧密后,通过定位孔钻孔、置钉。传统置钉组在C型臂X线机透视下徒手置钉。统计并对比两种置钉方法的准确率,通过测量并比较术前预设钉道角度与术后实际钉道角度差异评估进针角度的精确性。比较两组的置钉时间、手术时间、透视次数、术中出血量及患者颈肩部疼痛视觉模拟评分(visual analogue scale,VAS)和日本骨科协会(Japanese Orthopaedic Association,JOA)颈椎神经功能评分的差异情况。结果:两组患者在性别、年龄、临床诊断、病变节段、合并症及术前是否牵引复位方面均无统计学差异(P0.05)。19例3D打印导航模板辅助置入椎弓根螺钉68枚,置钉准确率94.1%,置钉时间2.2±0.4min/枚,透视次数4.6±1.1次,手术时间197±41min,术中出血量395±64ml;传统徒手置钉组置入椎弓根螺钉76枚,置钉准确率76.3%,置钉时间3.4±0.7min/枚,透视次数9.4±2.7次,手术时间245±67min,术中出血量552±79ml。两组置钉准确率、置钉时间、透视次数、手术时间及术中出血量均有统计学差异(P0.05)。3D打印导航模板组的内倾角及头倾角与预设值无统计学差异0.05),置钉角度的精确性明显优于徒手置钉组(P0.05)。术后3d、6个月及12个月患者颈肩部VAS及颈椎JOA评分较术前明显好转(P0.05),而术后6个月及12个月两组间颈肩部VAS及颈椎JOA评分无统计学差异(P0.05)。结论:3D打印导航模板辅助寰枢椎椎弓根置钉可提高置钉准确率,同时还可缩短置钉时间、手术时间,减少透视次数和术中出血量。     

传统寰枢椎后路椎弓根螺钉置钉技术和个性化导向模板辅助置钉技术的临床对比研究

【摘要】 目的：比较传统置钉技术与个性化导向模板辅助置钉技术手术治疗寰枢椎不稳症的置钉准确性。方法：回顾性分析2011年6月~2017年7月我科收治的寰枢椎不稳症患者56例（男33例,女23例）,男性年龄56.8±8.9岁（36~71岁）,女性年龄54.5±10.8岁（33~72岁）,其中30例行传统寰枢椎后路椎弓根螺钉内固定植骨融合术（对照组）,26例行个性化定点-定向导向模板辅助寰枢椎椎弓根螺钉内固定植骨融合术（观察组）。寰椎和枢椎定点导板均有长条状扶手设计。术后3d复查CT评估寰椎和枢椎螺钉置入的安全性,并将螺钉位置分为4级：0级,螺钉完全位于骨性钉道内;1级,在横断面或矢状面上,螺钉直径穿破骨皮质≤50%;2级,在横断面或矢状面上,螺钉直径穿破骨皮质＞50%;3级,螺钉直径完全穿破骨皮质。比较两组螺钉安全率（0级设为安全,1~3级设为存在风险）、手术时间、术中透视次数以及术中出血量。结果：寰椎椎弓根螺钉对照组0级48枚、1级7枚、2级2枚、3级1枚,观察组0级49枚、1级2枚、2级1枚、3级0枚,各级组间比较均无明显差异。枢椎椎弓根螺钉对照组0级53枚、1级6枚、2级1枚、3级0枚,观察组0级48枚、1级2枚、2级0枚、3级0枚,各级组间比较均无明显差异（P＞0.05）。螺钉安全率对照组及观察组组间比较存在差异（P=0.019）;平均手术时间对照组109.2±17.1min,观察组115.2±16.6min,两组间比较存在差异（P=0.009）;平均透视次数对照组12.50±1.95次,观察组6.85±2.44次,两组间比较存在差异（P＜0.0001）;平均术中出血对照组198.1±108.3ml,双导板组160.3±135.4ml,两组间比较无明显差异（P=0.216）。患者术后随访时间14~26个月（19.4±4.1个月）,所有病例行寰枢椎后路术后均获得融合。结论：改良个性化导向模板辅助寰枢椎椎弓根螺钉置钉技术比传统置钉技术更能有效减少术中X线透视次数并提高临床手术置钉的准确性。     

O型臂导航辅助下寰椎与枢椎逆向椎弓根螺钉置入技术的应用疗效及准确性研究

目的：分析O型臂导航辅助下寰椎与枢椎逆向椎弓根螺钉置入技术的应用疗效及准确性。方法：回顾性分析2020年1月至2022年12月收治的20例行经口寰枢椎复位植骨融合内固定术的寰枢椎脱位患者的相关资料。按照不同的置钉方式,20例患者分为导航辅助组及徒手置钉组,记录两组手术时间、术中出血量,术前及术后的斜坡椎管角（CCA）及延髓脊髓角（CMA）,对比分析两种置钉方式的应用疗效,采用改良Park的标准对逆向椎弓根钉置入的准确性进行评估比较。结果：两组患者的手术时间、术中出血量、术前术后CCA及CMA比较,差异均无统计学意义（P均>0.05）。两组患者术后CCA及CMA均较术前明显改善,差异有统计学意义（P<0.05）,导航辅助组置钉准确性优于徒手置钉组（P<0.05）。结论：通过O型臂导航技术辅助进行经口寰枢椎逆向椎弓根螺钉的置入可获得与徒手置钉相当的治疗疗效,同时提高螺钉置入的准确性,降低置钉相关并发症的风险。     

改良3D打印导航模板辅助寰枢椎椎弓根螺钉置钉的准确性分析

目的 :探讨改良3D打印导航模板辅助寰枢椎椎弓根螺钉置钉的准确性。方法:选择我院2015年6月~12月期间行寰枢椎手术的患者17例,男11例,女6例;年龄25~56岁,平均43.3±8.7岁;寰枢椎骨折脱位13例,寰枢椎畸形4例。术前将患者的寰枢椎CT数据导入Mimics17.0软件,生成目标椎体的三维模型,使用逆向工程原理设计与其表面相吻合的反向模板及椎弓根螺钉最佳钉道并生成相应导向通道,标杆相对通道向内侧平移约10mm,将导向通道及标杆与模板拟合一体,设计形成带有导向通道和标杆的改良导航模板。将设计好的导板通过3D打印机打印出来。在3D模型上模拟置钉,体外试验确认方案可行后再将改良导航模板消毒、灭菌并应用于临床。术中将改良3D打印导板与寰枢椎紧密贴合。术者分别以电钻及手钻通过导向通道,以标杆为参照物及导向杆,通过导向通道钻探螺钉通道后取下导板,攻丝后顺钉道置入椎弓根螺钉。将术前规划钉道与术后螺钉配对拟合进行螺钉精确性分析,并以Kawaguchi等评价法判断螺钉位置的优劣等级。结果:手术时间106±11min,术中出血量为220±73ml。共置入68枚颈椎椎弓根螺钉,其中寰椎与枢椎各34枚。术前预设进钉点、内倾角及头倾角与术后相比差异均无统计学意义(P0.05)。术后Kawaguchi等评价法显示:0级占97.06%(66/68),Ⅰ级占2.94%(2/68),有2枚螺钉穿破骨皮质,Ⅱ、Ⅲ级螺钉数为0。结论:通过改良3D打印导板辅助寰枢椎椎弓根置钉,可提高与术前预设最佳钉道的吻合度、精确匹配术前计划,可提高临床手术置钉的准确性,减少偏差。     

复合型3D打印导航模板辅助枢椎椎弓根或椎板置钉的临床研究

目的:探讨复合型3D打印导航模板辅助枢椎椎弓根螺钉或椎板螺钉置钉的可行性及临床疗效。方法:回顾性分析2015年1月~2017年5月我院收治的32例枢椎后路内固定手术患者资料,男20例,女12例;年龄21~77岁,平均57.3±9.0岁;随访12个月以上。根据置钉方法的不同进行分组,观察组(18例)采用术前计算机模拟置钉、设计并3D打印个体化导航模板辅助枢椎椎弓根或椎板螺钉置钉;对照组(14例)采用徒手方法置入枢椎椎弓根螺钉。记录两组置钉时间、术中出血量,以Kawaguchi评价法判断螺钉置钉成功率,计算术前模拟置钉和术后实际螺钉进钉点和进钉角度在X、Y、Z轴上的偏差,并进行统计学分析。结果:所有患者均顺利完成手术,无神经、重要血管损伤等严重并发症发生。观察组共置入螺钉36枚,其中枢椎椎弓根螺钉22枚,枢椎板螺钉14枚,置钉时间31.5±6.5min,术中出血量45.0±19.2ml,Kawaguchi评价法0级32枚,Ⅰ级4枚,Ⅱ级0枚,置钉成功率100%。对照组共置入28枚椎弓根螺钉,置钉时间57.6±6.9min,术中出血量228.5±57.9ml,以Kawaguchi评价法0级18枚,Ⅰ级6枚,Ⅱ级4枚,置钉成功率85.7%;两组置钉时间、术中出血量、置钉成功率相比差异均有统计学意义(P0.05)。术后实际钉道相对于术前模拟钉道偏差角度为0.69°±1.34°,术后实际进钉点相对于术前模拟进钉点在X、Y、Z轴上分别偏移0.50±2.13mm、0.75±2.18mm、0.43±2.39mm,偏移量与术前设计相比差异均无统计学意义(P0.05)。结论:通过复合型3D打印导航模板辅助枢椎椎弓根或椎板螺钉置钉,能减少置钉时间及术中出血,提高置钉成功率。     

3D打印个性化导板辅助后路寰枢椎置钉治疗寰枢椎脱位并齿突骨折

目的 评价3D打印个性化导板辅助后路寰枢椎置钉治疗寰枢椎脱位并齿突骨折的临床疗效。方法 选取2018年1月—2022年6月在上饶市人民医院接受治疗的20例寰枢椎脱位并齿突骨折患者,按照随机数字表法分为3D组和对照组,每组10例,3D组在3D打印个性化导板辅助下置钉,对照组采用徒手置钉。记录并比较2组手术时间、置钉时间、术中出血量、术中透视次数、置钉优良率及并发症发生情况。术前和术后1、6、12个月时采用疼痛视觉模拟量表（VAS）评分评估疼痛程度,采用日本骨科学会（JOA）评分评估颈椎功能。术后复查CT评价螺钉位置准确性。结果 所有手术顺利完成,所有患者术后随访> 6个月。术中共置入椎弓根螺钉80枚,无血管、神经损伤等并发症发生。3D组手术时间、置钉时间、术中出血量、术中透视次数、置钉优良率明显优于对照组,差异均有统计学意义（P <0.05）。2组术后各随访时间点VAS评分和JOA评分较术前明显改善,3D组术后6、12个月VAS评分及术后1、6、12个月JOA评分较对照组改善更明显,差异均有统计学意义（P <0.05）。结论 3D打印个性化导板辅助后路寰枢椎置钉治疗寰枢...     

个体化3D打印导板在寰枢椎椎弓根置钉中的初步应用

目的评估个体化3D打印导板辅助寰枢椎椎弓根螺钉技术在临床应用中的安全性及准确性。方法枢椎齿状突Ⅱ型骨折行后路椎弓根螺钉内固定术病人3例,根据寰枢椎后方骨性结构数据设计个体化导板,术中根据导板确定进针点,磨钻磨除进针点骨皮质,根据导板方向建立钉道,根据术前测量选择并拧入合适长度螺钉。术后通过观察螺钉在CT横断面和矢状面的位置来评估螺钉置入的安全性。结果术后CT检查显示共置入寰椎椎弓根螺钉6枚,枢椎椎弓根螺钉6枚,12枚螺钉均为0级螺钉。结论个体化3D打印导板能辅助寰枢椎椎弓根螺钉置钉技术,提高临床手术置钉的准确率和安全性,减少神经血管损伤。     

标杆型3D打印导板辅助寰枢椎椎弓根置钉准确度分析

目的探讨标杆型3D打印导板辅助寰枢椎椎弓根置钉的可行性,并进行置钉准确度分析。方法 2014年6月—2015年8月,本院收治寰枢椎脱位患者21例,男12例,女9例;年龄12~54岁,平均42.6岁。术前使用Mimics 17.0软件和3-matic 9.0软件为每例患者制作标杆型3D打印导板,术中使用标杆型3D打印导板辅助寰枢椎椎弓根置钉,术后患者行颈椎CT平扫。在Mimics 17.0软件中,将手术前后的寰枢椎模型及螺钉配对拟合,调整空间坐标轴,测量并比较术前预设钉道与术后实际钉道的内倾角、头倾角、进钉点坐标。结果 21例患者手术顺利,手术时间(193±51)min,术中出血量(384±127)m L。共置入寰椎椎弓根螺钉30枚,枢椎椎弓根螺钉42枚。除2枚寰椎椎弓根螺钉侵入椎管≤2 mm外,其他螺钉均位于椎弓根骨皮质内。寰椎左右侧预设最佳钉道内倾角度分别为9.4°±1.8°、9.8°±1.6°,实际钉道内倾角度分别为8.7°±1.6°、10.6°±2.2°;左右侧预设最佳钉道头倾角度分别为8.9°±2.5°、8.8°±2.3°,实际钉道头倾角度分别为9.3°±2.9°、9.4°±3.5°。枢椎左右侧预设最佳钉道内倾角度分别为21.9°±6.6°、22.4°±6.9°,左右侧实际钉道内倾角度分别为24.1°±6.3°、20.8°±6.4°;左右侧预设最佳钉道头倾角度分别为23.7°±7.3°、24.2°±7.2°,左右侧实际钉道头倾角度分别为22.1°±7.9°、22.3°±7.6°。寰枢椎术后实际钉道与术前预设最佳钉道的内倾角、头倾角、进钉点坐标差异均无统计学意义(P0.05)。结论标杆型3D打印导板辅助寰枢椎椎弓根置钉方向可调整性好,置钉准确度较高,为临床寰枢椎置钉提供了一种新的方法。     

3D打印辅助与徒手上颈椎椎弓钉置入比较

[目的]比较3D打印技术辅助上颈椎椎弓根螺钉的置入与徒手置钉的早期临床效果。[方法] 2010年5月—2019年5月,对18例上颈椎畸形患者行寰枢或颈枕融合固定术,其中,10例采用3D打印导板引导上颈椎椎弓根置入10例,8例采用常规徒手置钉。比较两组早期临床与影像资料。[结果]所有患者均顺利完成手术,手术共置钉72枚,其中3D组40枚,徒手组32枚。3D组手术时间[(189.7±16.1) min vs (242.1±23.2) min, P<0.001]、术中失血量[(216.6±49.8) ml vs (385.0±23.5) ml, P<0.001]、平均每钉置入时间[(3.3±0.8) min vs (7.0±1.1) min, P<0.001]和透视次数[(8.7±1.1)次vs (30.0±3.3)次, P<0.001]均显著优于徒手组。影像方面,3D组术前模拟置钉和实际置钉在螺钉直径、长度以及与后正中线距离的差异均无统计学意义（P>0.05）。3D组置钉准确优良率显著高于徒手组（97.5%vs 81.3%, P<0.05）。[结论]与传...     

标杆型3D打印导板在寰枢椎脱位治疗中的应用疗效及准确性研究

背景:寰枢椎解剖结构复杂,寰枢椎后方毗邻生命中枢延髓,徒手进行寰枢椎椎弓根置钉有较大难度,一旦出现置钉偏差即有可能造成椎动脉、脊髓、静脉丛及神经根的损伤。目的:探讨标杆型3D打印导板在寰枢椎脱位治疗中的应用疗效及准确性。方法:回顾性分析2017年1月至2019年3月收治的44例寰枢椎脱位患者的临床资料,根据治疗方式不同分为徒手置钉的对照组20例,标杆型3D打印导板辅助置钉的研究组24例。观察两组的手术时间、出血量、透视次数;术后复查CT判断置钉准确率;术前和术后6个月随访时采用日本骨科协会(JOA)颈椎神经功能评分评估患者的颈部神经功能,采用视觉模拟评分法(visual analogue scale,VAS)评估患者的枕颈部疼痛情况。结果:两组术中出血量及手术时间比较,差异无统计学意义(P>0.05),但研究组术中透视次数相比对照组少(P<0.05);研究组术后6个月的颈部神经功能及VAS评分明显优于对照组(P<0.05);研究组置钉准确率更高(P<0.05)。结论:借助标杆型3D打印导板可有效减少寰枢椎脱位治疗中的透视次数,提高椎弓根螺钉的置钉准确率,促进术后颈部神经功能恢复,降低枕颈部疼痛程度,值得临床推广。     

Biomechanical comparison of suture-button,bioabsorbable screw,and metal screw for ankle syndesmotic repair: A meta-analysis

BackgroundTo compare biomechanically metal screw fixation to suture-button or bioabsorbable screw fixation for ankle syndesmotic injuries.MethodsA literature search of the comparison studies in Pubmed and Google Scholar was conducted. The biomechanical outcomes of interest were syndesmotic stability in the coronal, sagittal, and axial planes as well as torque and rotation at failure.ResultsA total of 11 cadaveric studies were included. In the suture-button group, coronal displacement (MD 1.72 mm, p = 0.02) and sagittal displacement (MD 2.65 mm, p = 0.0003) were increased relative to the metal screw group. In contrast, no difference was found with axial rotation (MD 0.35 degrees, p = 0.57). Bioabsorbable screws exhibited equivalent failure torque (MD ?3.04 Nm, p = 0.53) and rotation at failure (MD 3.77 degrees, p = 0.48) in comparison to metal screws.ConclusionsSuture-button provide less rigidity when compared to metal screw fixation. They afford flexible syndesmotic micromotion which may more closely resemble a physiological state and be helpful for ligament healing. Bioabsorbable screws demonstrate similar mechanical strength properties to metal screws.     

微切口经皮椎弓根螺钉技术在腰椎微创融合手术中的临床应用

【】目的：探讨微切口经皮椎弓根螺钉技术在腰椎微创融合手术中的应用效果。方法：收集2011年2月～2014年1月采用微切口经皮椎弓根螺钉技术治疗的腰椎管狭窄症和腰椎滑脱症共122例。其中男77例,女45例,年龄45-70岁,平均57.8岁。采用Quadrant 微创通道下减压、椎间融合、微切口经皮椎弓根螺钉内固定和(或)对侧经皮椎弓根螺钉内固定的手术方式,统计手术切口长度、手术时间、术中出血量、术后椎间融合情况,术前与术后采用视觉模拟量表(VAS)、Oswestry功能障碍指数(ODI)和Nakai分级进行疗效评估。结果：122例患者手术的情况：单节段,手术切口长度3.0-3.5cm,平均3.2cm;手术时间105-247min,平均137min;出血量60-250ml,平均106ml;双节段,手术切口长度4.0-4.5cm,平均4.2cm;手术时间156-294min,平均188min;出血量90-380ml,平均157ml。112例患者获得随访,随访时间12-33个月,平均16.5个月,术后1个月、术后6个月、术后12个月VAS评分与ODI值均较术前下降,差异有统计学意义(P<0.05)。107例椎间骨性融合(95.5%),3例可能融合(2.7%),2例未融合(1.8%)。根据Nakai分级,优83例(74．1％),良20例(17．9％),可6例(5．4％) ,差3例(2.7%),优良率(92.0%)。结论：微创通道下减压椎间融合结合微切口经皮椎弓根螺钉技术治疗腰椎退行性疾病,可获得满意的临床疗效。     

Optimization of volar percutaneous screw fixation for scaphoid waist fractures using traction, positioning, imaging, and an angiocatheter guide

Percutaneous screw fixation of nondisplaced or reducible scaphoid fractures has become more popular as techniques and implants have improved. Many authors have advocated for the dorsal approach, citing difficulties with adequate screw placement from the volar approach. We have developed a straightforward and reproducible technique for volar percutaneous scaphoid screw fixation that mitigates most of the drawbacks of the approach. The wrist is held in extension and ulnar deviation with traction through the thumb. A 14-gauge angiocatheter needle is then used to localize the starting point and as a cannula for the guide wire. Specific fluoroscopic views help to confirm optimal guide wire placement.     

枢椎后路3种螺钉固定技术生物力学测试的对比研究

目的：评价单皮质和双皮质枢椎椎弓根螺钉、枢椎侧块螺钉和枢椎椎板螺钉的固定强度,为临床选择后路螺钉的固定方式提供生物力学依据。方法：利用30具新鲜尸体枢椎标本,进行单皮质和双皮质的枢椎椎弓根螺钉、枢椎侧块螺钉、枢椎椎板螺钉固定,测试比较其螺钉拔出强度。结果：双皮质枢椎椎弓根螺钉的拔出力量最大,为（1255.8±381.9）N;单皮质枢椎椎弓根螺钉[（901.8±373.3）N]、双皮质枢椎侧块螺钉[（776.1±306.8）N]和双皮质枢椎椎板螺钉[（640.8±302.9）N]之间差异无统计学意义。结论：枢椎后路螺钉固定宜首选椎弓根螺钉,枢椎侧块螺钉和枢椎椎板螺钉可作为枢椎后路补充固定技术,且以双皮质骨固定为宜。     

Development and validation of a quantitative method to assess pedicle screw loosening in posterior spine instrumentation on plain radiographs

Purpose

Currently, the diagnosis of pedicle screw (PS) loosening is based on a subjectively assessed halo sign, that is, a radiolucent line around the implant wider than 1 mm in plain radiographs. We aimed at development and validation of a quantitative method to diagnose PS loosening on radiographs.

Methods

Between 11/2004 and 1/2010 36 consecutive patients treated with thoraco-lumbar spine fusion with PS instrumentation without PS loosening were compared with 37 other patients who developed a clinically manifesting PS loosening. Three different angles were measured and compared regarding their capability to discriminate the loosened PS over the postoperative course. The inter-observer invariance was tested and a receiver operating characteristics curve analysis was performed.

Results

The angle measured between the PS axis and the cranial endplate was significantly different between the early and all later postoperative images. The Spearman correlation coefficient for the measurements of two observers at each postoperative time point ranged between 0.89 at 2 weeks to 0.94 at 2 months and 1 year postoperative. The angle change of 1.9° between immediate postoperative and 6-month postoperative was 75 % sensitive and 89 % specific for the identification of loosened screws (AUC = 0.82).

Discussion

The angle between the PS axis and the cranial endplate showed good ability to change in PS loosening. A change of this angle of at least 2° had a relatively high sensitivity and specificity to diagnose screw loosening.     

Perioperative course and accuracy of screw positioning in conventional, open robotic-guided and percutaneous robotic-guided, pedicle screw placement

Robotic-guided and percutaneous pedicle screw placement are emerging technologies. We here report a retrospective cohort analysis comparing conventional open to open robotic-guided and percutaneous robotic-guided pedicle screw placement. 112 patient records and CT scans were analyzed concerning the intraoperative and perioperative course. 35 patients underwent percutaneous, 20 open robotic-guided and 57 open conventional pedicle screw placement. 94.5% of robot-assisted and 91.4% of conventionally placed screws were found to be accurate. Percutaneous robotic and open robotic-guided subgroups did not differ obviously. Average X-ray exposure per screw was 34 s in robotic-guided compared to 77 s in conventional cases. Subgroup analysis indicates that percutaneously operated patients required less opioids, had a shorter hospitalization and lower rate of adverse events in the perioperative period. The use of robotic guidance significantly increased accuracy of screw positioning while reducing the X-ray exposure. Patients seem to have a better perioperative course following percutaneous procedures.     

Comparison of standard versus reconstruction proximal interlocking screw configurations for antegrade intramedullary nail fixation of femoral shaft fractures

BackgroundThe standard proximal interlocking screw (SS) configuration for antegrade intramedullary nail (IMN) fixation of femoral shaft fractures is lateral to medial or from the greater to less trochanter. Some authors argue for the routine use of the reconstruction screw (RS) configuration (oriented up the femoral neck) instead to prevent femoral neck complications. The purpose of this study was to compare a matched cohort of patients receiving these screw configurations and subsequent complications.MethodsA retrospective review of two urban level-one trauma centers identified adults with isolated femoral shaft fractures undergoing antegrade IMN. Patients with RS and SS configurations were matched 1:1 by age, sex, fracture location, and AO classification in order to compare complications.Results130 patients with femoral shaft fractures were identified. SS and RS configurations were used in 83 (64%) and 47 (36%) patients. 30 patients from each group were able to be matched for analysis. The RS and SS group did not differ in age, fracture location, AO classification, operative time, or number of distal interlocking screws. The RS group had fewer open fractures and were more likely to have two proximal screws. There were 7 complications, including 5 nonunions and 2 delayed unions, with no detectable difference between RS vs. SS groups (10% vs 13%, Proportional difference −3%, 95% confidence interval (CI) −30 to 14%, p = 0.1). There were no femoral neck complications in the entire cohort of 130 patients. On multivariate analysis none of the variables analyzed were independently associated with the development of complications.ConclusionsIn this matched cohort of patients with femoral shaft fractures undergoing antegrade IMN fixation, RS and SS configurations were associated with a similar number of complications and no femoral neck complications. The SS configuration remains the standard for antegrade IMN femoral shaft fixation.Level of evidenceLevel III, Retrospective cohort study.     

O型臂联合CT三维导航系统辅助颈椎椎弓根螺钉置入的准确性研究

目的:探讨O型臂联合CT三维导航系统辅助颈椎椎弓根螺钉置钉的准确性,并与侧块螺钉置钉进行比较.方法:回顾性分析2017年3月～2021年2月在我院分别使用O型臂联合CT三维导航系统辅助置入椎弓根螺钉与徒手置入侧块螺钉行颈椎后路内固定术的54例患者,其中男44例,女10例,年龄42～79岁(58.3±9.3岁).根据置钉...     

A multicentre,prospective, randomised comparison of the sliding hip screw with the Medoff sliding screw and side plate for unstable intertrochanteric hip fractures

Objective

This study aimed to compare the dynamic hip screw (DHS) and Medoff sliding plate (MSP) for unstable intertrochanteric hip fractures.

Design

A randomised, prospective trial design was used.

Setting

The study was undertaken in two level-1 trauma centres and one community hospital.

Patients/participants

A total of 163 patients with unstable intertrochanteric hip fractures (Orthopaedic Trauma Association (OTA) 31-A2) were randomised to DHS or MSP. Inclusion and exclusion criteria were designed to focus on isolated unstable intertrochanteric hip fractures in ambulatory patients.

Intervention

Randomisation was performed intra-operatively, after placement of a 135° guide wire. Follow-up assessments were performed at regular intervals for a minimum of 6 months.

Main outcome measurements

The primary outcome measure was re-operation rate. The secondary outcome was patient function, evaluated using a validated outcome measure, the Hip Fracture Functional Recovery Score. Tertiary outcomes included: mortality, hospital stay, quality of reduction and malunion rate.

Results

A total of 86 patients were randomised to DHS and 77 to MSP. The groups had similar patient demographics, pre-fracture status and in-hospital course. The quality of reduction was the same for each group, but the operative time was longer in the MSP group (61.6 vs. 50.1 min, P = 0.01). The rate of re-operation was low (3/86 in DHS and 2/77 in MSP) with no statistically significant difference. The functional outcomes were the same for both groups, with functional recovery scores at 6 months of 51.0% in the DHS arm and 49.7% in the MSP arm.

Conclusions

The two techniques produced similar results for the clinically important outcomes of the need for further surgery and functional status of the patients at 6 months’ follow-up.